But whatever else Mr. Madoff’s game was, it was certainly this: The first worldwide Ponzi scheme — a fraud that lasted longer, reached wider and cut deeper than any similar scheme in history, entirely eclipsing the puny regional ambitions of Charles Ponzi, the Boston swindler who gave his name to the scheme nearly a century ago.

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Regulators say Mr. Madoff himself estimated that $50 billion in personal and institutional wealth from around the world was gone. … Before it evaporated, it helped finance Mr. Madoff’s coddled lifestyle, with a Manhattan apartment, a beachfront mansion in the Hamptons, a small villa overlooking Cap d’Antibes on the French Riviera, a Mayfair office in London and yachts in New York, Florida and the Mediterranean.

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In 1960, as Wall Street was just shaking off its postwar lethargy and starting to buzz again, Bernie Madoff (pronounced MAY-doff) set up his small trading firm. His plan was to make a business out of trading lesser-known over-the-counter stocks on the fringes of the traditional stock market. He was just 22, a graduate of Hofstra University on Long Island.

By 1989, Mr. Madoff ‘s firm was handling more than 5 percent of the trading volume on the august New York Stock Exchange …

And in 1990, he became the nonexecutive chairman of the Nasdaq market, which at the time was operated as a committee of the National Association of Securities Dealers.

His rise on Wall Street was built on his belief in a visionary notion that seemed bizarre to many at the time: That stocks could be traded by people who never saw each other but were connected only by electronics.

In the mid-1970s, he had spent over $250,000 to upgrade the computer equipment at the Cincinnati Stock Exchange, where he began offering to buy and sell stocks that were listed on the Big Board. The exchange, in effect, was transformed into the first all-electronic computerized stock exchange.

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He also invested in new electronic trading technology for his firm, making it cheaper for brokerage firms to fill their stock orders. He eventually gained a large amount of business from big firms like A. G. Edwards & Sons, Charles Schwab & Company, Quick & Reilly and Fidelity Brokerage Services.

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By the end of the technology bubble in 2000, his firm was the largest market maker on the Nasdaq electronic market, and he was a member of the Securities Industry Association, now known as the Securities Industry and Financial Markets Association, Wall Street’s principal lobbying arm.